16:00The Official Chart on Radio 1 with Jack SaundersJason Derulo finds out if he's No.1!BBC Radio 1 Duration: 3 hours Sun 31st May 2015, 16:00 on BBC Radio 1 EnglandClara hears from Jason Derulo and reveals how his bid for the top spot has gone!GenresMusicPop & ChartBrandThe Official Chart on Radio 1 with Jack Saunders Source: BBC Online
